Mazak qt transformer tap voltage question

Okay, in need of Mazak advice.. Again.. This one should be easy for anyone that has done this. Adjustable transformer on my QT-15. Our last shop had 480V, so as the chart says inside the transformer, connect taps 1 to 5. There are three taps, connected by little alumn. bars, all 1 to 5 connected for 480 high voltage. Thats what I had, makes perfect sense.. Now, the new shop has 240V. On the chart, on the Mazak transformer, for low voltage 240 it says connect 2 and 4, and 3 and 7. Okay, but what about the third tap/leg?? Does one get omitted for low voltage?? What am I missing?? why does the chart only designate 2 places for connection? For high voltage three taps were connected, like I said 1 and 5. I would imagine it still needs 3 taps connected because its 3-phase, right??

There should be 3 places for the 2 to 4 and 3 to 7 connections.

Bill

Make sure you tap all three legs the same. Magic genie will visit if you do it wrong. We had to cork him right quick. Not a hard procedure, but not very forgiving.

Post a pic of the terminals. MS Paint where you intend to change connections.

Back and running again! Thanks guys!